Figure 2.

The micro optical images obtained by the Raman spectra. Micro optical images of (a) monolayer EG and (b) a GOx surface. Top graph illustrates the Raman spectra obtained from the bottom position
(curve A) or the small-particle position on the EG (curve B). (d) Bottom graph illustrates
the Raman spectra acquired from the bottom (curve C) and the particle position (curve
D) of the GOx surface. The inset images show magnified views of the areas indicated
by the white circles.